Ionia Weather Forecast

    • 41
    • 66

    Mostly Sunny

    • 50
    • 65

    Mostly Sunny

    • 54
    • 66

    Mostly Cloudy

    • 53
    • 64

    Slight Chance Rain Showers

    • 51
    • 64

    Mostly Cloudy

    • 51
    • 67

    Partly Sunny

    • 59
    • 73

    Chance Rain Showers

Today 24 Sep Ontario

Partly sunny with a 40 percent chance of Showers. Highs in the lower 70s.

Tonight 24 Sep Ontario

Mainly clear. Lows in the lower 40s. Light Winds.

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Ionia Temperature Statistics

September Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 15 September, 2026

    47.6 °F

  • Average September

    66.2 °F

  • Highest 2 September, 2026

    85.6 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.2 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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